Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 203.44 kDa 
• Atom Count: 16,464 
• Modelled Residue Count: 1,841 
• Deposited Residue Count: 1,856 
• Unique protein chains: 1

 4XLO

Crystal Structure of EncM (crystallized with 4 mM NADPH)

• PDB DOI: 10.2210/pdb4XLO/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Streptomyces maritimus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-01-13 Released: 2015-01-28 
• Deposition Author(s): Teufel, R.
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.67 Å
• R-Value Free: 0.230 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 

Literature

Flavin-mediated dual oxidation controls an enzymatic Favorskii-type rearrangement.

Teufel, R., Miyanaga, A., Michaudel, Q., Stull, F., Louie, G., Noel, J.P., Baran, P.S., Palfey, B., Moore, B.S.

(2013) Nature 503: 552-556

• PubMed: 24162851 
• DOI: 10.1038/nature12643
• Primary Citation of Related Structures:  
  3W8W, 3W8X, 3W8Z, 4XLO


• PubMed Abstract: 
  

Flavoproteins catalyse a diversity of fundamental redox reactions and are one of the most studied enzyme families. As monooxygenases, they are universally thought to control oxygenation by means of a peroxyflavin species that transfers a single atom of molecular oxygen to an organic substrate. Here we report that the bacterial flavoenzyme EncM catalyses the peroxyflavin-independent oxygenation-dehydrogenation dual oxidation of a highly reactive poly(β-carbonyl). The crystal structure of EncM with bound substrate mimics and isotope labelling studies reveal previously unknown flavin redox biochemistry. We show that EncM maintains an unexpected stable flavin-oxygenating species, proposed to be a flavin-N5-oxide, to promote substrate oxidation and trigger a rare Favorskii-type rearrangement that is central to the biosynthesis of the antibiotic enterocin. This work provides new insight into the fine-tuning of the flavin cofactor in offsetting the innate reactivity of a polyketide substrate to direct its efficient electrocyclization.

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Related Citations: 

• Flavin-mediated dual oxidation controls an enzymatic Favorskii-type rearrangement
  Teufel, R., Miyanaga, A., Michaudel, Q., Stull, F., Louie, G., Noel, J.P., Baran, P.S., Palfey, B., Moore, B.S.
  (2013) Nature 503: 552

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Organizational Affiliation: 

Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FAD-dependent oxygenase EncM	A, B, C, D	464	Streptomyces maritimus	Mutation(s): 0  Gene Names: encM
UniProt
Find proteins for Q9KHK2 (Streptomyces maritimus) Explore Q9KHK2  Go to UniProtKB:  Q9KHK2

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	E [auth A], F [auth B], G [auth C], H [auth D]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.67 Å
• R-Value Free: 0.230 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 
• Space Group: C 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 166.06	α = 90
b = 175.02	β = 90
c = 132.29	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
iMOSFLM	data reduction
MOSFLM	data reduction
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2015-01-28 
Deposition Author(s): Teufel, R.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	R01AI47818

Revision History  

• Version 1.0: 2015-01-28
  Type: Initial release
  
• Version 1.1: 2017-09-06
  Changes: Author supporting evidence, Derived calculations, Source and taxonomy
• Version 1.2: 2017-11-22
  Changes: Refinement description
• Version 1.3: 2019-12-11
  Changes: Author supporting evidence